Re: [PATCH] incorrect use of init_completion fixup

From: Nicholas Mc Guire
Date: Wed Dec 24 2014 - 14:11:20 EST

On Wed, 24 Dec 2014, Prarit Bhargava wrote:

> On 12/23/2014 12:52 PM, Nicholas Mc Guire wrote:
> > The successive init_completion calls should be reinit_completion here.
> >
> Hi Nicholas,
> I know enough about this code to break it ;) ... what condition did you hit that
> led you to this patch?

Was writing up documentation for completion (also posted today) and the
intended API is reinit_completion which is just resetting the counter but
not touching the related waitqueu. So the failure scenario would be
a race between accessing elements on the current wait-queue and the
init_completion reinitializing this very wait-queue.

Further if switching from init_completion -> reinit_completion brakes
anything then it really *is* broken now.

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